两者都有“同意”、“赞成”的意思。
agree with 后面常接表示人或意见(看法)的名词作宾语。agree with 还有“适合”、“符合”的含义。如：The climate here doesn't agree with him.他不适合这里的气候。
agree to 后面一般接表示提议、办法、计划之类的名词作宾语。
agree on就…达成一致的意见。
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